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cd9e9808 MB |
1 | /* |
2 | * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. | |
3 | * Initial release: Matias Bjorling <m@bjorling.me> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License version | |
7 | * 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; see the file COPYING. If not, write to | |
16 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
17 | * USA. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/blkdev.h> | |
22 | #include <linux/blk-mq.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/sem.h> | |
26 | #include <linux/bitmap.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/miscdevice.h> | |
29 | #include <linux/lightnvm.h> | |
30 | #include <uapi/linux/lightnvm.h> | |
31 | ||
32 | static LIST_HEAD(nvm_targets); | |
33 | static LIST_HEAD(nvm_mgrs); | |
34 | static LIST_HEAD(nvm_devices); | |
35 | static DECLARE_RWSEM(nvm_lock); | |
36 | ||
37 | static struct nvm_tgt_type *nvm_find_target_type(const char *name) | |
38 | { | |
39 | struct nvm_tgt_type *tt; | |
40 | ||
41 | list_for_each_entry(tt, &nvm_targets, list) | |
42 | if (!strcmp(name, tt->name)) | |
43 | return tt; | |
44 | ||
45 | return NULL; | |
46 | } | |
47 | ||
48 | int nvm_register_target(struct nvm_tgt_type *tt) | |
49 | { | |
50 | int ret = 0; | |
51 | ||
52 | down_write(&nvm_lock); | |
53 | if (nvm_find_target_type(tt->name)) | |
54 | ret = -EEXIST; | |
55 | else | |
56 | list_add(&tt->list, &nvm_targets); | |
57 | up_write(&nvm_lock); | |
58 | ||
59 | return ret; | |
60 | } | |
61 | EXPORT_SYMBOL(nvm_register_target); | |
62 | ||
63 | void nvm_unregister_target(struct nvm_tgt_type *tt) | |
64 | { | |
65 | if (!tt) | |
66 | return; | |
67 | ||
68 | down_write(&nvm_lock); | |
69 | list_del(&tt->list); | |
70 | up_write(&nvm_lock); | |
71 | } | |
72 | EXPORT_SYMBOL(nvm_unregister_target); | |
73 | ||
74 | void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, | |
75 | dma_addr_t *dma_handler) | |
76 | { | |
16f26c3a | 77 | return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags, |
cd9e9808 MB |
78 | dma_handler); |
79 | } | |
80 | EXPORT_SYMBOL(nvm_dev_dma_alloc); | |
81 | ||
82 | void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list, | |
83 | dma_addr_t dma_handler) | |
84 | { | |
85 | dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler); | |
86 | } | |
87 | EXPORT_SYMBOL(nvm_dev_dma_free); | |
88 | ||
89 | static struct nvmm_type *nvm_find_mgr_type(const char *name) | |
90 | { | |
91 | struct nvmm_type *mt; | |
92 | ||
93 | list_for_each_entry(mt, &nvm_mgrs, list) | |
94 | if (!strcmp(name, mt->name)) | |
95 | return mt; | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
762796bc MB |
100 | struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev) |
101 | { | |
102 | struct nvmm_type *mt; | |
103 | int ret; | |
104 | ||
105 | lockdep_assert_held(&nvm_lock); | |
106 | ||
107 | list_for_each_entry(mt, &nvm_mgrs, list) { | |
108 | ret = mt->register_mgr(dev); | |
109 | if (ret < 0) { | |
110 | pr_err("nvm: media mgr failed to init (%d) on dev %s\n", | |
111 | ret, dev->name); | |
112 | return NULL; /* initialization failed */ | |
113 | } else if (ret > 0) | |
114 | return mt; | |
115 | } | |
116 | ||
117 | return NULL; | |
118 | } | |
119 | ||
cd9e9808 MB |
120 | int nvm_register_mgr(struct nvmm_type *mt) |
121 | { | |
762796bc | 122 | struct nvm_dev *dev; |
cd9e9808 MB |
123 | int ret = 0; |
124 | ||
125 | down_write(&nvm_lock); | |
762796bc | 126 | if (nvm_find_mgr_type(mt->name)) { |
cd9e9808 | 127 | ret = -EEXIST; |
762796bc MB |
128 | goto finish; |
129 | } else { | |
cd9e9808 | 130 | list_add(&mt->list, &nvm_mgrs); |
762796bc MB |
131 | } |
132 | ||
133 | /* try to register media mgr if any device have none configured */ | |
134 | list_for_each_entry(dev, &nvm_devices, devices) { | |
135 | if (dev->mt) | |
136 | continue; | |
137 | ||
138 | dev->mt = nvm_init_mgr(dev); | |
139 | } | |
140 | finish: | |
cd9e9808 MB |
141 | up_write(&nvm_lock); |
142 | ||
143 | return ret; | |
144 | } | |
145 | EXPORT_SYMBOL(nvm_register_mgr); | |
146 | ||
147 | void nvm_unregister_mgr(struct nvmm_type *mt) | |
148 | { | |
149 | if (!mt) | |
150 | return; | |
151 | ||
152 | down_write(&nvm_lock); | |
153 | list_del(&mt->list); | |
154 | up_write(&nvm_lock); | |
155 | } | |
156 | EXPORT_SYMBOL(nvm_unregister_mgr); | |
157 | ||
158 | static struct nvm_dev *nvm_find_nvm_dev(const char *name) | |
159 | { | |
160 | struct nvm_dev *dev; | |
161 | ||
162 | list_for_each_entry(dev, &nvm_devices, devices) | |
163 | if (!strcmp(name, dev->name)) | |
164 | return dev; | |
165 | ||
166 | return NULL; | |
167 | } | |
168 | ||
169 | struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun, | |
170 | unsigned long flags) | |
171 | { | |
172 | return dev->mt->get_blk(dev, lun, flags); | |
173 | } | |
174 | EXPORT_SYMBOL(nvm_get_blk); | |
175 | ||
176 | /* Assumes that all valid pages have already been moved on release to bm */ | |
177 | void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
178 | { | |
179 | return dev->mt->put_blk(dev, blk); | |
180 | } | |
181 | EXPORT_SYMBOL(nvm_put_blk); | |
182 | ||
183 | int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) | |
184 | { | |
185 | return dev->mt->submit_io(dev, rqd); | |
186 | } | |
187 | EXPORT_SYMBOL(nvm_submit_io); | |
188 | ||
189 | int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk) | |
190 | { | |
191 | return dev->mt->erase_blk(dev, blk, 0); | |
192 | } | |
193 | EXPORT_SYMBOL(nvm_erase_blk); | |
194 | ||
069368e9 MB |
195 | void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd) |
196 | { | |
197 | int i; | |
198 | ||
199 | if (rqd->nr_pages > 1) { | |
200 | for (i = 0; i < rqd->nr_pages; i++) | |
201 | rqd->ppa_list[i] = dev_to_generic_addr(dev, | |
202 | rqd->ppa_list[i]); | |
203 | } else { | |
204 | rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr); | |
205 | } | |
206 | } | |
207 | EXPORT_SYMBOL(nvm_addr_to_generic_mode); | |
208 | ||
209 | void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd) | |
210 | { | |
211 | int i; | |
212 | ||
213 | if (rqd->nr_pages > 1) { | |
214 | for (i = 0; i < rqd->nr_pages; i++) | |
215 | rqd->ppa_list[i] = generic_to_dev_addr(dev, | |
216 | rqd->ppa_list[i]); | |
217 | } else { | |
218 | rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr); | |
219 | } | |
220 | } | |
221 | EXPORT_SYMBOL(nvm_generic_to_addr_mode); | |
222 | ||
223 | int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr ppa) | |
224 | { | |
225 | int plane_cnt = 0, pl_idx, ret; | |
226 | struct nvm_rq rqd; | |
227 | ||
228 | if (!dev->ops->erase_block) | |
229 | return 0; | |
230 | ||
231 | if (dev->plane_mode == NVM_PLANE_SINGLE) { | |
232 | rqd.nr_pages = 1; | |
233 | rqd.ppa_addr = ppa; | |
234 | } else { | |
235 | plane_cnt = (1 << dev->plane_mode); | |
236 | rqd.nr_pages = plane_cnt; | |
237 | ||
238 | rqd.ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, | |
239 | &rqd.dma_ppa_list); | |
240 | if (!rqd.ppa_list) { | |
241 | pr_err("nvm: failed to allocate dma memory\n"); | |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
245 | for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { | |
246 | ppa.g.pl = pl_idx; | |
247 | rqd.ppa_list[pl_idx] = ppa; | |
248 | } | |
249 | } | |
250 | ||
251 | nvm_generic_to_addr_mode(dev, &rqd); | |
252 | ||
253 | ret = dev->ops->erase_block(dev, &rqd); | |
254 | ||
255 | if (plane_cnt) | |
256 | nvm_dev_dma_free(dev, rqd.ppa_list, rqd.dma_ppa_list); | |
257 | ||
258 | return ret; | |
259 | } | |
260 | EXPORT_SYMBOL(nvm_erase_ppa); | |
261 | ||
cd9e9808 MB |
262 | static int nvm_core_init(struct nvm_dev *dev) |
263 | { | |
264 | struct nvm_id *id = &dev->identity; | |
265 | struct nvm_id_group *grp = &id->groups[0]; | |
266 | ||
267 | /* device values */ | |
268 | dev->nr_chnls = grp->num_ch; | |
269 | dev->luns_per_chnl = grp->num_lun; | |
270 | dev->pgs_per_blk = grp->num_pg; | |
271 | dev->blks_per_lun = grp->num_blk; | |
272 | dev->nr_planes = grp->num_pln; | |
273 | dev->sec_size = grp->csecs; | |
274 | dev->oob_size = grp->sos; | |
275 | dev->sec_per_pg = grp->fpg_sz / grp->csecs; | |
7386af27 | 276 | memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format)); |
cd9e9808 MB |
277 | |
278 | dev->plane_mode = NVM_PLANE_SINGLE; | |
279 | dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; | |
280 | ||
4264c980 MB |
281 | if (grp->mtype != 0) { |
282 | pr_err("nvm: memory type not supported\n"); | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
286 | if (grp->fmtype != 0 && grp->fmtype != 1) { | |
287 | pr_err("nvm: flash type not supported\n"); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
cd9e9808 MB |
291 | if (grp->mpos & 0x020202) |
292 | dev->plane_mode = NVM_PLANE_DOUBLE; | |
293 | if (grp->mpos & 0x040404) | |
294 | dev->plane_mode = NVM_PLANE_QUAD; | |
295 | ||
296 | /* calculated values */ | |
297 | dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes; | |
298 | dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk; | |
299 | dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun; | |
300 | dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls; | |
301 | ||
302 | dev->total_blocks = dev->nr_planes * | |
303 | dev->blks_per_lun * | |
304 | dev->luns_per_chnl * | |
305 | dev->nr_chnls; | |
306 | dev->total_pages = dev->total_blocks * dev->pgs_per_blk; | |
307 | INIT_LIST_HEAD(&dev->online_targets); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void nvm_free(struct nvm_dev *dev) | |
313 | { | |
314 | if (!dev) | |
315 | return; | |
316 | ||
317 | if (dev->mt) | |
318 | dev->mt->unregister_mgr(dev); | |
cd9e9808 MB |
319 | } |
320 | ||
321 | static int nvm_init(struct nvm_dev *dev) | |
322 | { | |
480fc0db | 323 | int ret = -EINVAL; |
cd9e9808 MB |
324 | |
325 | if (!dev->q || !dev->ops) | |
480fc0db | 326 | return ret; |
cd9e9808 | 327 | |
16f26c3a | 328 | if (dev->ops->identity(dev, &dev->identity)) { |
cd9e9808 | 329 | pr_err("nvm: device could not be identified\n"); |
cd9e9808 MB |
330 | goto err; |
331 | } | |
332 | ||
333 | pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n", | |
334 | dev->identity.ver_id, dev->identity.vmnt, | |
335 | dev->identity.cgrps); | |
336 | ||
337 | if (dev->identity.ver_id != 1) { | |
338 | pr_err("nvm: device not supported by kernel."); | |
339 | goto err; | |
340 | } | |
341 | ||
342 | if (dev->identity.cgrps != 1) { | |
343 | pr_err("nvm: only one group configuration supported."); | |
344 | goto err; | |
345 | } | |
346 | ||
347 | ret = nvm_core_init(dev); | |
348 | if (ret) { | |
349 | pr_err("nvm: could not initialize core structures.\n"); | |
350 | goto err; | |
351 | } | |
352 | ||
cd9e9808 MB |
353 | pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n", |
354 | dev->name, dev->sec_per_pg, dev->nr_planes, | |
355 | dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns, | |
356 | dev->nr_chnls); | |
357 | return 0; | |
358 | err: | |
cd9e9808 MB |
359 | pr_err("nvm: failed to initialize nvm\n"); |
360 | return ret; | |
361 | } | |
362 | ||
363 | static void nvm_exit(struct nvm_dev *dev) | |
364 | { | |
365 | if (dev->ppalist_pool) | |
366 | dev->ops->destroy_dma_pool(dev->ppalist_pool); | |
367 | nvm_free(dev); | |
368 | ||
369 | pr_info("nvm: successfully unloaded\n"); | |
370 | } | |
371 | ||
372 | int nvm_register(struct request_queue *q, char *disk_name, | |
373 | struct nvm_dev_ops *ops) | |
374 | { | |
375 | struct nvm_dev *dev; | |
376 | int ret; | |
377 | ||
378 | if (!ops->identity) | |
379 | return -EINVAL; | |
380 | ||
381 | dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); | |
382 | if (!dev) | |
383 | return -ENOMEM; | |
384 | ||
385 | dev->q = q; | |
386 | dev->ops = ops; | |
387 | strncpy(dev->name, disk_name, DISK_NAME_LEN); | |
388 | ||
389 | ret = nvm_init(dev); | |
390 | if (ret) | |
391 | goto err_init; | |
392 | ||
d160147b WT |
393 | if (dev->ops->max_phys_sect > 256) { |
394 | pr_info("nvm: max sectors supported is 256.\n"); | |
395 | ret = -EINVAL; | |
396 | goto err_init; | |
397 | } | |
398 | ||
cd9e9808 | 399 | if (dev->ops->max_phys_sect > 1) { |
16f26c3a | 400 | dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist"); |
cd9e9808 MB |
401 | if (!dev->ppalist_pool) { |
402 | pr_err("nvm: could not create ppa pool\n"); | |
93e70c1f MB |
403 | ret = -ENOMEM; |
404 | goto err_init; | |
cd9e9808 | 405 | } |
cd9e9808 MB |
406 | } |
407 | ||
762796bc | 408 | /* register device with a supported media manager */ |
edad2e66 | 409 | down_write(&nvm_lock); |
762796bc | 410 | dev->mt = nvm_init_mgr(dev); |
edad2e66 MB |
411 | list_add(&dev->devices, &nvm_devices); |
412 | up_write(&nvm_lock); | |
413 | ||
cd9e9808 MB |
414 | return 0; |
415 | err_init: | |
416 | kfree(dev); | |
417 | return ret; | |
418 | } | |
419 | EXPORT_SYMBOL(nvm_register); | |
420 | ||
421 | void nvm_unregister(char *disk_name) | |
422 | { | |
d0a712ce | 423 | struct nvm_dev *dev; |
cd9e9808 | 424 | |
d0a712ce WT |
425 | down_write(&nvm_lock); |
426 | dev = nvm_find_nvm_dev(disk_name); | |
cd9e9808 MB |
427 | if (!dev) { |
428 | pr_err("nvm: could not find device %s to unregister\n", | |
429 | disk_name); | |
d0a712ce | 430 | up_write(&nvm_lock); |
cd9e9808 MB |
431 | return; |
432 | } | |
433 | ||
cd9e9808 MB |
434 | list_del(&dev->devices); |
435 | up_write(&nvm_lock); | |
c1480ad5 MB |
436 | |
437 | nvm_exit(dev); | |
438 | kfree(dev); | |
cd9e9808 MB |
439 | } |
440 | EXPORT_SYMBOL(nvm_unregister); | |
441 | ||
442 | static const struct block_device_operations nvm_fops = { | |
443 | .owner = THIS_MODULE, | |
444 | }; | |
445 | ||
446 | static int nvm_create_target(struct nvm_dev *dev, | |
447 | struct nvm_ioctl_create *create) | |
448 | { | |
449 | struct nvm_ioctl_create_simple *s = &create->conf.s; | |
450 | struct request_queue *tqueue; | |
cd9e9808 MB |
451 | struct gendisk *tdisk; |
452 | struct nvm_tgt_type *tt; | |
453 | struct nvm_target *t; | |
454 | void *targetdata; | |
cd9e9808 MB |
455 | |
456 | if (!dev->mt) { | |
762796bc MB |
457 | pr_info("nvm: device has no media manager registered.\n"); |
458 | return -ENODEV; | |
cd9e9808 MB |
459 | } |
460 | ||
762796bc | 461 | down_write(&nvm_lock); |
cd9e9808 MB |
462 | tt = nvm_find_target_type(create->tgttype); |
463 | if (!tt) { | |
464 | pr_err("nvm: target type %s not found\n", create->tgttype); | |
d0a712ce | 465 | up_write(&nvm_lock); |
cd9e9808 MB |
466 | return -EINVAL; |
467 | } | |
468 | ||
cd9e9808 MB |
469 | list_for_each_entry(t, &dev->online_targets, list) { |
470 | if (!strcmp(create->tgtname, t->disk->disk_name)) { | |
471 | pr_err("nvm: target name already exists.\n"); | |
472 | up_write(&nvm_lock); | |
473 | return -EINVAL; | |
474 | } | |
475 | } | |
476 | up_write(&nvm_lock); | |
477 | ||
478 | t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); | |
479 | if (!t) | |
480 | return -ENOMEM; | |
481 | ||
482 | tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); | |
483 | if (!tqueue) | |
484 | goto err_t; | |
485 | blk_queue_make_request(tqueue, tt->make_rq); | |
486 | ||
487 | tdisk = alloc_disk(0); | |
488 | if (!tdisk) | |
489 | goto err_queue; | |
490 | ||
491 | sprintf(tdisk->disk_name, "%s", create->tgtname); | |
492 | tdisk->flags = GENHD_FL_EXT_DEVT; | |
493 | tdisk->major = 0; | |
494 | tdisk->first_minor = 0; | |
495 | tdisk->fops = &nvm_fops; | |
496 | tdisk->queue = tqueue; | |
497 | ||
498 | targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end); | |
499 | if (IS_ERR(targetdata)) | |
500 | goto err_init; | |
501 | ||
502 | tdisk->private_data = targetdata; | |
503 | tqueue->queuedata = targetdata; | |
504 | ||
505 | blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); | |
506 | ||
507 | set_capacity(tdisk, tt->capacity(targetdata)); | |
508 | add_disk(tdisk); | |
509 | ||
510 | t->type = tt; | |
511 | t->disk = tdisk; | |
512 | ||
513 | down_write(&nvm_lock); | |
514 | list_add_tail(&t->list, &dev->online_targets); | |
515 | up_write(&nvm_lock); | |
516 | ||
517 | return 0; | |
518 | err_init: | |
519 | put_disk(tdisk); | |
520 | err_queue: | |
521 | blk_cleanup_queue(tqueue); | |
522 | err_t: | |
523 | kfree(t); | |
524 | return -ENOMEM; | |
525 | } | |
526 | ||
527 | static void nvm_remove_target(struct nvm_target *t) | |
528 | { | |
529 | struct nvm_tgt_type *tt = t->type; | |
530 | struct gendisk *tdisk = t->disk; | |
531 | struct request_queue *q = tdisk->queue; | |
532 | ||
533 | lockdep_assert_held(&nvm_lock); | |
534 | ||
535 | del_gendisk(tdisk); | |
d09f9581 JG |
536 | blk_cleanup_queue(q); |
537 | ||
cd9e9808 MB |
538 | if (tt->exit) |
539 | tt->exit(tdisk->private_data); | |
540 | ||
cd9e9808 MB |
541 | put_disk(tdisk); |
542 | ||
543 | list_del(&t->list); | |
544 | kfree(t); | |
545 | } | |
546 | ||
547 | static int __nvm_configure_create(struct nvm_ioctl_create *create) | |
548 | { | |
549 | struct nvm_dev *dev; | |
550 | struct nvm_ioctl_create_simple *s; | |
551 | ||
d0a712ce | 552 | down_write(&nvm_lock); |
cd9e9808 | 553 | dev = nvm_find_nvm_dev(create->dev); |
d0a712ce | 554 | up_write(&nvm_lock); |
cd9e9808 MB |
555 | if (!dev) { |
556 | pr_err("nvm: device not found\n"); | |
557 | return -EINVAL; | |
558 | } | |
559 | ||
560 | if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) { | |
561 | pr_err("nvm: config type not valid\n"); | |
562 | return -EINVAL; | |
563 | } | |
564 | s = &create->conf.s; | |
565 | ||
566 | if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) { | |
567 | pr_err("nvm: lun out of bound (%u:%u > %u)\n", | |
568 | s->lun_begin, s->lun_end, dev->nr_luns); | |
569 | return -EINVAL; | |
570 | } | |
571 | ||
572 | return nvm_create_target(dev, create); | |
573 | } | |
574 | ||
575 | static int __nvm_configure_remove(struct nvm_ioctl_remove *remove) | |
576 | { | |
577 | struct nvm_target *t = NULL; | |
578 | struct nvm_dev *dev; | |
579 | int ret = -1; | |
580 | ||
581 | down_write(&nvm_lock); | |
582 | list_for_each_entry(dev, &nvm_devices, devices) | |
583 | list_for_each_entry(t, &dev->online_targets, list) { | |
584 | if (!strcmp(remove->tgtname, t->disk->disk_name)) { | |
585 | nvm_remove_target(t); | |
586 | ret = 0; | |
587 | break; | |
588 | } | |
589 | } | |
590 | up_write(&nvm_lock); | |
591 | ||
592 | if (ret) { | |
593 | pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname); | |
594 | return -EINVAL; | |
595 | } | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | #ifdef CONFIG_NVM_DEBUG | |
601 | static int nvm_configure_show(const char *val) | |
602 | { | |
603 | struct nvm_dev *dev; | |
604 | char opcode, devname[DISK_NAME_LEN]; | |
605 | int ret; | |
606 | ||
607 | ret = sscanf(val, "%c %32s", &opcode, devname); | |
608 | if (ret != 2) { | |
609 | pr_err("nvm: invalid command. Use \"opcode devicename\".\n"); | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
d0a712ce | 613 | down_write(&nvm_lock); |
cd9e9808 | 614 | dev = nvm_find_nvm_dev(devname); |
d0a712ce | 615 | up_write(&nvm_lock); |
cd9e9808 MB |
616 | if (!dev) { |
617 | pr_err("nvm: device not found\n"); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
621 | if (!dev->mt) | |
622 | return 0; | |
623 | ||
2fde0e48 | 624 | dev->mt->lun_info_print(dev); |
cd9e9808 MB |
625 | |
626 | return 0; | |
627 | } | |
628 | ||
629 | static int nvm_configure_remove(const char *val) | |
630 | { | |
631 | struct nvm_ioctl_remove remove; | |
632 | char opcode; | |
633 | int ret; | |
634 | ||
635 | ret = sscanf(val, "%c %256s", &opcode, remove.tgtname); | |
636 | if (ret != 2) { | |
637 | pr_err("nvm: invalid command. Use \"d targetname\".\n"); | |
638 | return -EINVAL; | |
639 | } | |
640 | ||
641 | remove.flags = 0; | |
642 | ||
643 | return __nvm_configure_remove(&remove); | |
644 | } | |
645 | ||
646 | static int nvm_configure_create(const char *val) | |
647 | { | |
648 | struct nvm_ioctl_create create; | |
649 | char opcode; | |
650 | int lun_begin, lun_end, ret; | |
651 | ||
652 | ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev, | |
653 | create.tgtname, create.tgttype, | |
654 | &lun_begin, &lun_end); | |
655 | if (ret != 6) { | |
656 | pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n"); | |
657 | return -EINVAL; | |
658 | } | |
659 | ||
660 | create.flags = 0; | |
661 | create.conf.type = NVM_CONFIG_TYPE_SIMPLE; | |
662 | create.conf.s.lun_begin = lun_begin; | |
663 | create.conf.s.lun_end = lun_end; | |
664 | ||
665 | return __nvm_configure_create(&create); | |
666 | } | |
667 | ||
668 | ||
669 | /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */ | |
670 | static int nvm_configure_by_str_event(const char *val, | |
671 | const struct kernel_param *kp) | |
672 | { | |
673 | char opcode; | |
674 | int ret; | |
675 | ||
676 | ret = sscanf(val, "%c", &opcode); | |
677 | if (ret != 1) { | |
678 | pr_err("nvm: string must have the format of \"cmd ...\"\n"); | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | switch (opcode) { | |
683 | case 'a': | |
684 | return nvm_configure_create(val); | |
685 | case 'd': | |
686 | return nvm_configure_remove(val); | |
687 | case 's': | |
688 | return nvm_configure_show(val); | |
689 | default: | |
690 | pr_err("nvm: invalid command\n"); | |
691 | return -EINVAL; | |
692 | } | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static int nvm_configure_get(char *buf, const struct kernel_param *kp) | |
698 | { | |
699 | int sz = 0; | |
700 | char *buf_start = buf; | |
701 | struct nvm_dev *dev; | |
702 | ||
703 | buf += sprintf(buf, "available devices:\n"); | |
704 | down_write(&nvm_lock); | |
705 | list_for_each_entry(dev, &nvm_devices, devices) { | |
706 | if (sz > 4095 - DISK_NAME_LEN) | |
707 | break; | |
708 | buf += sprintf(buf, " %32s\n", dev->name); | |
709 | } | |
710 | up_write(&nvm_lock); | |
711 | ||
712 | return buf - buf_start - 1; | |
713 | } | |
714 | ||
715 | static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = { | |
716 | .set = nvm_configure_by_str_event, | |
717 | .get = nvm_configure_get, | |
718 | }; | |
719 | ||
720 | #undef MODULE_PARAM_PREFIX | |
721 | #define MODULE_PARAM_PREFIX "lnvm." | |
722 | ||
723 | module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL, | |
724 | 0644); | |
725 | ||
726 | #endif /* CONFIG_NVM_DEBUG */ | |
727 | ||
728 | static long nvm_ioctl_info(struct file *file, void __user *arg) | |
729 | { | |
730 | struct nvm_ioctl_info *info; | |
731 | struct nvm_tgt_type *tt; | |
732 | int tgt_iter = 0; | |
733 | ||
734 | if (!capable(CAP_SYS_ADMIN)) | |
735 | return -EPERM; | |
736 | ||
737 | info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); | |
738 | if (IS_ERR(info)) | |
739 | return -EFAULT; | |
740 | ||
741 | info->version[0] = NVM_VERSION_MAJOR; | |
742 | info->version[1] = NVM_VERSION_MINOR; | |
743 | info->version[2] = NVM_VERSION_PATCH; | |
744 | ||
745 | down_write(&nvm_lock); | |
746 | list_for_each_entry(tt, &nvm_targets, list) { | |
747 | struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; | |
748 | ||
749 | tgt->version[0] = tt->version[0]; | |
750 | tgt->version[1] = tt->version[1]; | |
751 | tgt->version[2] = tt->version[2]; | |
752 | strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); | |
753 | ||
754 | tgt_iter++; | |
755 | } | |
756 | ||
757 | info->tgtsize = tgt_iter; | |
758 | up_write(&nvm_lock); | |
759 | ||
76e25081 SM |
760 | if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { |
761 | kfree(info); | |
cd9e9808 | 762 | return -EFAULT; |
76e25081 | 763 | } |
cd9e9808 MB |
764 | |
765 | kfree(info); | |
766 | return 0; | |
767 | } | |
768 | ||
769 | static long nvm_ioctl_get_devices(struct file *file, void __user *arg) | |
770 | { | |
771 | struct nvm_ioctl_get_devices *devices; | |
772 | struct nvm_dev *dev; | |
773 | int i = 0; | |
774 | ||
775 | if (!capable(CAP_SYS_ADMIN)) | |
776 | return -EPERM; | |
777 | ||
778 | devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); | |
779 | if (!devices) | |
780 | return -ENOMEM; | |
781 | ||
782 | down_write(&nvm_lock); | |
783 | list_for_each_entry(dev, &nvm_devices, devices) { | |
784 | struct nvm_ioctl_device_info *info = &devices->info[i]; | |
785 | ||
786 | sprintf(info->devname, "%s", dev->name); | |
787 | if (dev->mt) { | |
788 | info->bmversion[0] = dev->mt->version[0]; | |
789 | info->bmversion[1] = dev->mt->version[1]; | |
790 | info->bmversion[2] = dev->mt->version[2]; | |
791 | sprintf(info->bmname, "%s", dev->mt->name); | |
792 | } else { | |
793 | sprintf(info->bmname, "none"); | |
794 | } | |
795 | ||
796 | i++; | |
797 | if (i > 31) { | |
798 | pr_err("nvm: max 31 devices can be reported.\n"); | |
799 | break; | |
800 | } | |
801 | } | |
802 | up_write(&nvm_lock); | |
803 | ||
804 | devices->nr_devices = i; | |
805 | ||
76e25081 SM |
806 | if (copy_to_user(arg, devices, |
807 | sizeof(struct nvm_ioctl_get_devices))) { | |
808 | kfree(devices); | |
cd9e9808 | 809 | return -EFAULT; |
76e25081 | 810 | } |
cd9e9808 MB |
811 | |
812 | kfree(devices); | |
813 | return 0; | |
814 | } | |
815 | ||
816 | static long nvm_ioctl_dev_create(struct file *file, void __user *arg) | |
817 | { | |
818 | struct nvm_ioctl_create create; | |
819 | ||
820 | if (!capable(CAP_SYS_ADMIN)) | |
821 | return -EPERM; | |
822 | ||
823 | if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) | |
824 | return -EFAULT; | |
825 | ||
826 | create.dev[DISK_NAME_LEN - 1] = '\0'; | |
827 | create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; | |
828 | create.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
829 | ||
830 | if (create.flags != 0) { | |
831 | pr_err("nvm: no flags supported\n"); | |
832 | return -EINVAL; | |
833 | } | |
834 | ||
835 | return __nvm_configure_create(&create); | |
836 | } | |
837 | ||
838 | static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) | |
839 | { | |
840 | struct nvm_ioctl_remove remove; | |
841 | ||
842 | if (!capable(CAP_SYS_ADMIN)) | |
843 | return -EPERM; | |
844 | ||
845 | if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) | |
846 | return -EFAULT; | |
847 | ||
848 | remove.tgtname[DISK_NAME_LEN - 1] = '\0'; | |
849 | ||
850 | if (remove.flags != 0) { | |
851 | pr_err("nvm: no flags supported\n"); | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | return __nvm_configure_remove(&remove); | |
856 | } | |
857 | ||
858 | static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) | |
859 | { | |
860 | void __user *argp = (void __user *)arg; | |
861 | ||
862 | switch (cmd) { | |
863 | case NVM_INFO: | |
864 | return nvm_ioctl_info(file, argp); | |
865 | case NVM_GET_DEVICES: | |
866 | return nvm_ioctl_get_devices(file, argp); | |
867 | case NVM_DEV_CREATE: | |
868 | return nvm_ioctl_dev_create(file, argp); | |
869 | case NVM_DEV_REMOVE: | |
870 | return nvm_ioctl_dev_remove(file, argp); | |
871 | } | |
872 | return 0; | |
873 | } | |
874 | ||
875 | static const struct file_operations _ctl_fops = { | |
876 | .open = nonseekable_open, | |
877 | .unlocked_ioctl = nvm_ctl_ioctl, | |
878 | .owner = THIS_MODULE, | |
879 | .llseek = noop_llseek, | |
880 | }; | |
881 | ||
882 | static struct miscdevice _nvm_misc = { | |
883 | .minor = MISC_DYNAMIC_MINOR, | |
884 | .name = "lightnvm", | |
885 | .nodename = "lightnvm/control", | |
886 | .fops = &_ctl_fops, | |
887 | }; | |
888 | ||
889 | MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR); | |
890 | ||
891 | static int __init nvm_mod_init(void) | |
892 | { | |
893 | int ret; | |
894 | ||
895 | ret = misc_register(&_nvm_misc); | |
896 | if (ret) | |
897 | pr_err("nvm: misc_register failed for control device"); | |
898 | ||
899 | return ret; | |
900 | } | |
901 | ||
902 | static void __exit nvm_mod_exit(void) | |
903 | { | |
904 | misc_deregister(&_nvm_misc); | |
905 | } | |
906 | ||
907 | MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>"); | |
908 | MODULE_LICENSE("GPL v2"); | |
909 | MODULE_VERSION("0.1"); | |
910 | module_init(nvm_mod_init); | |
911 | module_exit(nvm_mod_exit); |